Synthesis of binder-free fluffy anemone-like MoS2 for electrocatalytic hydrogen evolution: A Mott-schottky study

Meresht, Fereshteh Mostafavi; Iranizad, E. Saievar; Zare, Ali Hooshyar; Bayat, Amir; Liavali, Mehrdad Najafi

doi:10.1016/j.ijhydene.2020.07.198

Cited by 21 publications

(6 citation statements)

References 68 publications

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“…The Mott–Schottky plots of the as-fabricated electrodes are presented in Figure f, which were employed to estimate the density of carriers. The density of carriers can be calculated by drawing the Mott–Schottky plots and using eq where C sc is the capacitance of the space charge layer, V is the applied voltage, V fb is the flat-band potential, k B is the Boltzmann constant (1.38 × 10 –23 J K –1 ), T is the temperature of the operation (300 K), ε is the dielectric constant of Sb 2 Te 3 , ε 0 is the dielectric constant of free space (8.854 × 10 –12 F m –1 ), A is the electrochemically active surface area, e is the electronic charge (1.603 × 10 –19 C), and N D is the density of carriers, which is calculated from the slope of the graph.…”

Section: Resultsmentioning

confidence: 89%

“…In addition, the lower the slope, the higher the density of carriers. The slopes of Fe 1e14 -Sb 2 Te 3 /Ti, Fe 4e14 -Sb 2 Te 3 /Ti, and Fe 8e14 -Sb 2 Te 3 /Ti are gentle than that of Sb 2 Te 3 /Ti, and Fe 8e14 -Sb 2 Te 3 /Ti exhibits the minimum slope, suggesting the gradually improved conductivity from Fe 1e14 -Sb 2 Te 3 /Ti to Fe 8e14 -Sb 2 Te 3 /Ti. , It contributed to improving the electron transport capability, thereby enhancing their HER catalytic activity.…”

Section: Resultsmentioning

confidence: 97%

“…The slopes of Fe 1e14 -Sb 2 Te 3 /Ti, Fe 4e14 -Sb 2 Te 3 /Ti, and Fe 8e14 -Sb 2 Te 3 /Ti are gentle than that of Sb 2 Te 3 /Ti, and Fe 8e14 -Sb 2 Te 3 /Ti exhibits the minimum slope, suggesting the gradually improved conductivity from Fe 1e14 -Sb 2 Te 3 /Ti to Fe 8e14 -Sb 2 Te 3 /Ti. 37,39 It contributed to improving the electron transport capability, thereby enhancing their HER catalytic activity. This may be due to the fact that more defects are exposed after ion irradiation of Sb 2 Te 3 /Ti, thereby increasing its conductivity.…”

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confidence: 99%

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Defect Engineering of Sb₂Te₃ through Different Doses of Ion Irradiation to Boost Hydrogen Evolution Reaction Performance

Wang

Huang

Liu

et al. 2021

ACS Appl. Energy Mater.

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Two-dimensional transition-metal chalcogenides (TMCs) have great potential as high-efficiency hydrogen evolution reaction (HER) catalysts to replace the traditional noble-metal catalysts. Although many strategies have been developed to improve the efficiency of the HER of TMCs, how to accurately and appropriately regulate the catalyst to increase the catalytic activity remains a challenge. Here, this work reports a strategy for regulating the defects of Sb2Te3 by ion irradiation technology to improve the activity of HER and studies the effect of irradiation dose on material properties in detail. Electrochemical tests show that compared with the original Sb2Te3, the HER performance of Sb2Te3 irradiated with Fe10+ is significantly improved in an acidic solution. Through the analysis of high-resolution transmission electron microscopy images, it is found that various defects appear on the surface of Sb2Te3 after irradiation with iron ions. The generation of defects not only increases the active sites but also improves the conductivity of the material. It is worth noting that the Fe10+ irradiation changes the surface hydrophilicity of the Sb2Te3 material and accelerates the desorption of hydrogen bubbles, which can expose the active sites in time and reduce the damage to the material caused by the desorption of large bubbles. This strategy of regulating the surface defects of materials by changing the irradiation dose provides an idea for the performance control of electrocatalysts.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 97%

mentioning

confidence: 99%

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Defect Engineering of Sb₂Te₃ through Different Doses of Ion Irradiation to Boost Hydrogen Evolution Reaction Performance

Wang

Huang

Liu

et al. 2021

ACS Appl. Energy Mater.

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“…To further characterize the interfacial charge polarization and band structure alteration, the ultraviolet photoelectron spectra (UPS) of the pure Mo 5 N 6 and 2H‐MoS 2 are analyzed (Figure S13, Supporting Information). The work functions of Mo 5 N 6 and 2H‐MoS 2 are 7.62 and 5.83 eV, [ 31 ] respectively. The pure Mo 5 N 6 exhibit strong metallic features (Figure S14, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

In‐Plane Mott–Schottky Effects Enabling Efficient Hydrogen Evolution from Mo₅N₆‐MoS₂ Heterojunction Nanosheets in Universal‐pH Electrolytes

Zhang

et al. 2022

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Cost‐effective electrocatalysts for the hydrogen evolution reaction (HER) spanning a wide pH range are highly desirable but still challenging for hydrogen production via electrochemical water splitting. Herein, Mo5N6‐MoS2 heterojunction nanosheets prepared on hollow carbon nanoribbons (Mo5N6‐MoS2/HCNRs) are designed as Mott–Schottky electrocatalysts for efficient pH‐universal HER. The in‐plane Mo5N6‐MoS2 Mott–Schottky heterointerface induces electron redistribution and a built‐in electric field, which effectively activates the inert MoS2 basal planes to intrinsically increase the electrocatalytic activity, improve electronic conductivity, and boost water dissociation activity. Moreover, the vertical Mo5N6‐MoS2 nanosheets provide more activated sites for the electrochemical reaction and facilitate mass/electrolyte transport, while the tightly coupled HCNRs substrate and metallic Mo5N6 provide fast electron transfer paths. Consequently, the Mo5N6‐MoS2/HCNRs electrocatalyst delivers excellent pH‐universal HER performances exemplified by ultralow overpotentials of 57, 59, and 53 mV at a current density of 10 mA cm−2 in acidic, neutral, and alkaline electrolytes with Tafel slopes of 38.4, 43.5, and 37.9 mV dec−1, respectively, which are superior to those of the reported MoS2‐based catalysts and outperform Pt in overall water splitting. This work proposes a new strategy to construct an in‐plane heterointerface on the nanoscale and provides fresh insights into the HER electrocatalytic mechanism of MoS2‐based heterostructures.

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“…However, the low conductivity and limited exposed active sites of 2D MoS 2 hinder its practical application. So far, several strategies were applied to enhance the HER activity of MoS 2 , such as, fabricating nanostrucuture MoS 2 to increase the active sites [12][13][14], doping transition metals in MoS 2 to increase the intrinsic catalytic activity [15,16], or coupling with conductive substrates to increase the conductivity [17,18].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical tubular MoP/MoS2 composite with enhanced electrochemical hydrogen evolution activity

Wang

Diao

et al. 2021

J Mater Sci: Mater Electron

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Electrocatalytic production of hydrogen from water is a promising and sustainable strategy. Herein, hierarchical tubular MoP/MoS 2 composites with the wall composed of loosely stacked nanosheets were fabricated through partially phosphating the tubular MoS 2 . As an electrocatayst for hydrogen evolution reaction (HER), the hierarchical tubular MoP/MoS 2 composite displayed a superior HER activity with a low overpotential (101 mV) to obtain a current density of 10 mA/cm 2 , small Tafel slope (56 mV/dec).Moreover, the MoP/MoS 2 composite demonstrate superior long-term durability in acid electrolytes. The excellent catalytic activity of MoP/MoS 2 composite may be ascribed to its hierarchical structure: hierarchical porous structure can offer mass diffusion pathways, and the nanosheets with MoP/MoS 2 heterojunctions can provide rich active sites for HER. Density functional theory (DFT) calculations reveal that more favorable H* adsorption kinetics on the surface of the MoP/MoS 2 composite during the HER process than pristine MoP and MoS 2 . This work can offer a strategy to design high performance electrocatalysts for HER applications.

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Synthesis of binder-free fluffy anemone-like MoS2 for electrocatalytic hydrogen evolution: A Mott-schottky study

Cited by 21 publications

References 68 publications

Defect Engineering of Sb₂Te₃ through Different Doses of Ion Irradiation to Boost Hydrogen Evolution Reaction Performance

Defect Engineering of Sb₂Te₃ through Different Doses of Ion Irradiation to Boost Hydrogen Evolution Reaction Performance

In‐Plane Mott–Schottky Effects Enabling Efficient Hydrogen Evolution from Mo₅N₆‐MoS₂ Heterojunction Nanosheets in Universal‐pH Electrolytes

Hierarchical tubular MoP/MoS2 composite with enhanced electrochemical hydrogen evolution activity

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Synthesis of binder-free fluffy anemone-like MoS2 for electrocatalytic hydrogen evolution: A Mott-schottky study

Cited by 21 publications

References 68 publications

Defect Engineering of Sb2Te3 through Different Doses of Ion Irradiation to Boost Hydrogen Evolution Reaction Performance

Defect Engineering of Sb2Te3 through Different Doses of Ion Irradiation to Boost Hydrogen Evolution Reaction Performance

In‐Plane Mott–Schottky Effects Enabling Efficient Hydrogen Evolution from Mo5N6‐MoS2 Heterojunction Nanosheets in Universal‐pH Electrolytes

Hierarchical tubular MoP/MoS2 composite with enhanced electrochemical hydrogen evolution activity

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Defect Engineering of Sb₂Te₃ through Different Doses of Ion Irradiation to Boost Hydrogen Evolution Reaction Performance

Defect Engineering of Sb₂Te₃ through Different Doses of Ion Irradiation to Boost Hydrogen Evolution Reaction Performance

In‐Plane Mott–Schottky Effects Enabling Efficient Hydrogen Evolution from Mo₅N₆‐MoS₂ Heterojunction Nanosheets in Universal‐pH Electrolytes